Last modified: 7 December 2018

URL: http://cxc.harvard.edu/caldb/prop_plan/pimms/index.html

Cycle 21 PIMMS Effective Areas

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Released as of 13 DEC 2018


The PIMMS Cycle 21 effective areas are illustrated below. As is always the case, the time-delay factor for the ACIS contaminant build-up has been updated; However, the ACIS CONTAM file has been updated as well for both ACIS-I and ACIS-S. This new CONTAM model predicts a somewhat reduced QE loss compared with the previous one. Additionally, the old HRC-I QE file has been replaced with a series of time-displaced QE files (i.e. files with sequential validity start dates, in CalDB 4.7.9), and the HRC-S QEU time-dependent files have been updated as well (in CalDB 4.8.2).

The model OBS_IDs and the ARF-building scripts have now been standardized for Chandra PIMMS calculations. Hence the procedures are the same as with cy20.


The Cycle 21 PIMMS Effective Area Public Information describes how the effective area files were generated, including the new HETG and LETG GREFFs and the new HRC-S QE file.

Effective area plots are provided for the following detector configurations:


Left Column: Linear Scale

Center Column: Log Scale

Right Column: Difference Plot

ACIS-I Aimpoint Effective Areas

The black traces indicate ACIS effective areas uncorrected for OBF contamination.
Linear plot of ACIS-I aimpoint     effective area Logarithmic plot of ACIS-I aimpoint     effective area Diff plot of ACIS-I aimpoint     effective area

ACIS-S Aimpoint Effective Areas

The black traces indicate ACIS effective areas uncorrected for OBF contamination.
Linear plot of ACIS-S aimpoint     effective area Logarithmic plot of ACIS-S     aimpoint effective area Diff plot of ACIS-S     aimpoint effective area

HRC-I Aimpoint Effective Areas

Linear plot of HRC-I aimpoint     effective area Logarithmic plot of HRC-I     aimpoint effective area Diff plot of HRC-I     aimpoint effective area

HRC-S Aimpoint Effective Areas

Linear plot of HRC-S aimpoint     effective area Logarithmic plot of HRC-S     aimpoint effective area Diff plot of HRC-S     aimpoint effective area

HETG/ACIS-I Effective Areas

Linear plot of     HETG/ACIS-I zeroth-order effective area Logarithmic plot of     HETG/ACIS-I zeroth-order effective area Diff plot of     HETG/ACIS-I zeroth-order effective area

HETG/ACIS-S Effective Areas

Linear plot of     HETG/ACIS-S zeroth-order effective area Logarithmic plot of     HETG/ACIS-S zeroth-order effective area Diff plot of     HETG/ACIS-S zeroth-order effective area
Linear plot of     HETG/ACIS-S first-order MEG effective area Logarithmic plot of     HETG/ACIS-S first-order MEG effective area Diff plot of     HETG/ACIS-S first-order MEG effective area
Linear plot of     HETG/ACIS-S first-order HEG effective area Logarithmic plot of     HETG/ACIS-S first-order HEG effective area Diff plot of     HETG/ACIS-S first-order HEG effective area
Linear plot of     HETG/ACIS-S first-order HEG+MEG effective area Logarithmic  plot of     HETG/ACIS-S first-order HEG+MEG effective area Diff plot of     HETG/ACIS-S first-order HEG+MEG effective area

LETG/ACIS-I Effective Areas

Linear plot of     LETG/ACIS-I zeroth-order effective area Logarithmic plot of     LETG/ACIS-I zeroth-order effective area Diff plot of     LETG/ACIS-I zeroth-order effective area

LETG/ACIS-S Effective Areas

Linear plot of     LETG/ACIS-S zeroth-order effective area Logarithmic plot of     LETG/ACIS-S zeroth-order effective area Diff plot of     LETG/ACIS-S zeroth-order effective area
Linear plot of     LETG/ACIS-S first-order effective area Logarithmic plot of     LETG/ACIS-S first-order effective area Diff plot of     LETG/ACIS-S first-order effective area

LETG/HRC-I Effective Areas

Linear plot of     LETG/HRC-I zeroth-order effective area Logarithmic plot of     LETG/HRC-I zeroth-order effective area Diff plot of     LETG/HRC-I zeroth-order effective area

LETG/HRC-S Effective Areas

Linear plot of     LETG/HRC-S zeroth-order effective area Logarithmic plot of     LETG/HRC-S zeroth-order effective area Diff plot of     LETG/HRC-S zeroth-order effective area
Linear plot of     LETG/HRC-S first-order effective area Logarithmic plot of     LETG/HRC-S first-order effective area Diff plot of     LETG/HRC-S first-order effective area
Linear plot of     LETG/HRC-S second- to tenth-order summed effective area Logarithmic plot of     LETG/HRC-S second- to tenth-order summed effective area Diff plot of     LETG/HRC-S second- to tenth-order summed effective area

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